The only thing that comes to mind though is if your blinkers will blink at an odd rate, since it will be missing the load of the extra light bulb. You may need to add a resistor to the blinker lines to emulate a bulb, or put a fender blinker in or something...

Yea I'll have to do some probing with a test light to find out exactly which wire goes to where in the plug. I'll give Uhaul a call and see what their price is, otherwise I'll just go ahead and order the one I linked.

The only thing that comes to mind though is if your blinkers will blink at an odd rate, since it will be missing the load of the extra light bulb. You may need to add a resistor to the blinker lines to emulate a bulb, or put a fender blinker in or something...

hmm yea that may be an issue. Guess I'll have to cross that bridge when I get to it. Wiring in a resistor if needed shouldn't be too difficult.

Finished putting together my harness today, works like a charm. My signals flash at a normal rate when im off the brakes. But when the brakes are compressed at the same time as the turn signal they hyperflash. I still have the stock incandescent bulbs in. I plan on converting all my external lights over to led eventually so ill need to install that ep-27 relay to solve the hyperflashing problem. Will the relay solve the hyperflashing problem im having now with the stock bulbs and continue to solve the problem once i swap over to led?

Still need to replace the 194 bulbs on the outside of each tail.
Would it be possible to wire up that outside 194 bulb to my brake/turn signal feed as well so it functions like my 3157 bulbs (running/brake/turn) or can it only be utilized as a running light?